Concept
Version 9
Created by Boundless
The Olmec
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Olmec colossal Heads."
http://en.wikipedia.org/wiki/Olmec_colossal_heads%23mediaviewer/File:Mexico.Tab.OlmecHead.01.jpg
Wikipedia
CC BY-SA 3.0.